JPH0143126Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" (Field of industrial application) The present invention relates to a continuous sand filter device.

(Prior Art) Many sand filters used in the treatment of water, sewage and wastewater are continuous type, which have a large processing capacity and are easy to operate. Generally speaking, this continuous sand filter system has an air lift pipe in the center of the sand filter tank, and while filtering the raw water,
Overlayered sand is taken in from the bottom of the tank, and while rising through the sand pipe, the different rising speeds of the sand, water, and air are used to wash and separate the pollutants adhering to the sand. Only the sand that has been removed is returned to the overlayer. However, such conventional devices have the disadvantage that the cleaning power in the sand pumping pipe is insufficient and the overperformance is not good. For this reason, the sand discharged from the sand pumping pipe has been further processed by putting it into a special cleaning device, but this has made the device complicated and difficult to operate.

(Problems to be solved by the invention) In view of the above-mentioned circumstances, the present invention improves the drawbacks of the continuous sand filter device that circulates the sand using an air lift, and improves the cleaning and separation of the sand. This was done with the aim of providing a device with excellent performance.

``Structure of the invention'' (Means for solving the problem) The present invention is based on the provision of a resistor for inhibiting upward flow in the airlift sand pipe installed in the center of the overtank. This is a characteristic feature.

(Example) Hereinafter, an example of the sand filter device of the present invention will be described with reference to the drawings.

In the drawing, reference numeral 1 denotes an overtank formed long in the vertical direction, and in the center thereof, there is a sand pumping pipe 3 whose upper and lower ends are opened at a required interval between the tank bottom and the top plate 2 of the tank. It is erected. In addition, raw water inflow pipes 4, 4 protrude into the lower part of the tank 1, distro viewers 5, 5 are provided at the open ends thereof, and treated water flows out into the upper part of the tank 1. tube 6
An air supply pipe 7 is connected to the lower part of the sand pumping pipe 3, which communicates with an air supply source (not shown) outside the tank 1.

In the upper part of the tank 1, a sand reservoir 8 is provided surrounding the sand pumping pipe 3. The lower part of this sand basin 8 is constricted into a funnel shape, and a narrow bent discharge path 9 is formed, and an opening 10 is opened downward. In the upper part of the sand basin 8, a drain port 12 connected to a discharge pipe 11 leading to the outside of the tank 1 opens at a position lower than the opening of the treated water outflow pipe 6.

Inside the sand lifting pipe 3, a shaft rod 14 having a large number of protrusions 13, 13 fixed along the axis of the sand lifting pipe 3 is installed as a resistor. This shaft rod 14 may be fixed, or the upper part of the shaft rod 14 may be connected to the top plate 2.
It may be made to protrude further and rotated by an appropriate driving means. Furthermore, the resistor provided in the sand pumping pipe 3 is not limited to the one described above; for example, a net-like body may be provided at intervals on the shaft rod 14, or the shaft rod 14 may be excluded and the sand pumping pipe 3 is It is also possible to provide a projection or the like directly on the tube 3.

In addition, 15 in the figure is oversand.

(Function) Next, the operation of the sand filter device having the above configuration will be explained.

Sand 15 is stored in the tank 1 to a required height to form an overlayer, and raw water flows into the lower part of the tank 1 from the inflow pipe 4, and is distributed evenly over the entire area of the overlayer by the distro viewer 5. You can be sorted out. The inflowing raw water rises through the overlayer, the SS is removed, and becomes clear filtrate water, which is taken out of the tank through the upper outflow pipe 6. The sand 15 that has trapped pollutants is introduced from the lower end opening of the sand pumping pipe 3 and rises due to the air lift effect caused by the air blown into the sand pumping pipe 3 from the air supply pipe 7. The sand flows into the sand basin 8 from the upper end opening. In the sand pumping pipe 3, the sand 15, water, and air rise at different speeds, so that the pollutants attached to the sand 15 are separated by this action. is provided with resistors such as the protrusions 13, 13, so the upward flow is disturbed and the cleaning action of the sand is increased, and the sand itself collides with the resistors such as the protrusions 13, removing pollutants. With the addition of mechanical peeling action, sand and pollutants can be separated well.

The sewage containing pollutants separated from the sand in this way overflows the drain port 12 of the sand basin 8 and is discharged outside the tank from the drain pipe, and the sand is bent under its own weight and discharged into a narrow narrow space at the bottom of the sand basin 8. Opening 10 through road 9
It will fall from the ground, be dispersed in the superlayer, and return. At this time, since there is a water level difference between the tank 1 and the sand basin 8, the water in the tank 1 flows into the sand basin 8 through the opening 10, and flows through the discharge path 9 against the flow of sand. As a result, the sand will be further cleaned.

``Effects of the invention'' As explained above, the present invention has a resistor that blocks the upward flow in the sand-lifting pipe installed in the center of the overtank, so that the sand in the sand-lifting pipe is In addition to the cleaning and separation effect caused by the difference in rising speed between water and air, the disturbance of the upward flow and the impact against the resistor facilitate the cleaning and peeling of pollutants adhering to the sand, resulting in cleaning and separation of the sand. The effectiveness has been significantly increased, and it is now possible to separate highly viscous pollutants that were previously difficult to separate.
It is possible to provide an efficient sand filtering device that can greatly improve the overperformance of the device, has a simple structure, is easy to operate, and can be manufactured at low cost.

[Brief explanation of drawings]

The drawing is a side sectional view showing one embodiment of the device of the present invention. 1... Pass tank, 3... Sand pumping pipe, 4... Raw water inflow pipe, 7... Air pipe, 8... Sand reservoir, 10... Opening,
13... protrusion, 14... shaft rod.

Claims (1)

[Scope of utility model registration request] An air lift pipe is installed in the sand tank,
A sand filtering device characterized in that a resistor for inhibiting the flow in the sand pumping pipe is provided in the sand pumping pipe.